The Reason.

Opposites. They are omnipresent within our world today. Every object is differing, no matter in what subtle way. Opposites, through thier clash and congregation, forms the backbone of our cosmic realm.

"and the elements So mixed in him that nature might stand upAnd say to all the world “This was a man.” Antony, in Julius Caesar, act 5, sc. 5, l. 72-4 (1623). These opposites, create our world.

Chinese Philosophy credits 5 elements, wood, fire,earth,water,metal.
Western terms it as 4, Air, Fire, Water, Earth.

All these, are opposites, intra-reacting among themselves.

Opposites attract. So here's hoping for a GF..............